One flight, late June through July northward and in Colorado; several flights southward, February to October in Florida, April to October in Texas (Scott 1986). May to October in south, mid-June through July in north (Glassberg 2001). Mid-July to mid-August in Canada (Layberry et al. 1998). Late June through July in the Rocky Mountain states (Ferris and Brown 1981), late June to late July in Colorado (Scott and Scott 1978), late June through July in North Dakota (Mccabe and Post 1976).

Southern Alberta and Saskatchewan south along Rocky Mountain front in Colorado and New Mexico to western Texas, east across extreme southern Canada to southern Ontario, southern New England, and throughout most of eastern US (Ferris and Brown 1981; Scott 1986; Layberry et al. 1998; Opler and Wright 1999; Glassberg 2001). Usually below 1890 m elevation in the Rocky Mountain states (Brown 1957; Scott and Scott 1978; Ferris and Brown 1981). In Montana, reported from at least 13 eastern counties as far west as Hill and Cascade counties (Kohler 1980; Stanford and Opler 1993; FLMNH Lepidopterists' Society database), to at least 1150 m elevation. Mainly rare to uncommon in the western US (Glassberg 2001).

Scott, J.A. 1975b. Mate-locating behavior of western North American butterflies. Journal of Research on the Lepidoptera 14:1-40.

Scott, J.A. 1979. Hibernal diapause of North American Papilionoidea and Hesperioidea. Journal of Research on the Lepidoptera 18(3): 171-200.

Scott, J.A. 1986. The butterflies of North America: a natural history and field guide. Stanford University Press, Stanford, California.

Scott, J.A. 1992. Hostplant records for butterflies and skippers (mostly from Colorado) 1959-1992, with new life histories and notes on oviposition, immatures, and ecology. Papilio new series #6. 185 p.

Scott, J.A. 2006. Butterfly hostplant records, 1992-2005, with a treatise on the evolution of Erynnis, and a note on new terminology for mate-locating behavior. Papilio new series #14. 74 p.

Scott, J.A. 2014. Lepidoptera of North America 13. Flower visitation by Colorado butterflies (40,615 records) with a review of the literature on pollination of Colorado plants and butterfly attraction (Lepidoptera: Hersperioidea and Papilionoidea). Contributions of the C.P. Gillette Museum of Arthopod Diversity. Fort Collins, CO: Colorado State University. 190 p.

Scott, J.A. and G.R. Scott. 1978. Ecology and distribution of the butterflies of southern central Colorado. Journal of Research on the Lepidoptera 17(2): 73-128.